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Vented Screws / Vacuum Screws characteristics/function :Low Outgas

These screws are suitable for use in vacuum chambers.

They efficiently discharge gas accumulated in screw holes or drilled holes, achieving stability in vacuum levels and high vacuum.
The gas vent holes in NBK's vacuum equipment screws are processed in a way that minimally affects the metal structure, reducing the risk
of brittle fracture during use and the generation of outgassing in vacuum environments.
          Vacuum_1en

Selection Conditions
  • Select characteristics/functionLow Outgas
Image Vented Socket Head Cap Screws - Chemical Polish Washers with Ventilation Grooves Washers with Ventilation Grooves - Chemical Polish Vented High Strength Stainless Steel Socket Head Cap Screws – Specialized Chemical Polishing Hex Socket Head Cap Screw with Captive Washer and Ventilation Hole - Chemical Polish Vented Flanged Socket Head Cap Screws – Specialized Chemical Polishing Socket Head Cap Captive Screws with Ventilation Hole Hex Socket Head Cap Screws with Ventilation Hole - Titanium Vented Socket Head Cap Screws with Ultra Low Profile - Titanium
Part Name Vented Socket Head Cap Screws - Chemical Polish Washers with Ventilation Grooves Washers with Ventilation Grooves - Chemical Polish Vented High Strength Stainless Steel Socket Head Cap Screws – Specialized Chemical Polishing Hex Socket Head Cap Screw with Captive Washer and Ventilation Hole - Chemical Polish Vented Flanged Socket Head Cap Screws – Specialized Chemical Polishing Socket Head Cap Captive Screws with Ventilation Hole Hex Socket Head Cap Screws with Ventilation Hole - Titanium Vented Socket Head Cap Screws with Ultra Low Profile - Titanium
Part Number SVSS-PC SWAS-VF SWAS-VF-PC SVSLG-PC SVSI1S-PC SVFSS-PC SSC-SVSS SVST SVSHT
Feature Low Outgas Standard Low outgas High Strength (Strength Class 10.8 Equivalent) Captive Washers
I=1		 With Flange
Low Outgas		 Captive /
Loss Prevention		 Lightweight
Nonmagnetic
Chemical Resistance		 Lightweight
Sapce-Saving
Ultra Low Profile
Nonmagnetic
Chemical Resistance
Material SUSXM7 (Equivalent to SUS304) SUS304 SUS304 SUS316L SUSXM7 (Equivalent to SUS304) SUSXM7 (Equivalent to SUS304) SUSXM7 (Equivalent to SUS304) Grade 2 Titanium Grade 2 Titanium
Surface Treatment Special Chemical Polishing - Special Chemical Polishing Special Chemical Polishing Special Chemical Polishing Special Chemical Polishing - Special Chemical Polishing Special Chemical Polishing
Thread Size M3 ～ M12 M2 ～ M12 M3 ～ M12 M3 ～ M6 M3 ～ M6 M4 ～ M8 M3 ～ M8 M3 ～ M5 M3 ～ M6
Operating Temperature (℃) - - - - - - - - -
CAD CAD CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SVSS-M10-PC SVSS-M12-PC SVSS-M3-PC SVSS-M4-PC SVSS-M5-PC SVSS-M6-PC SVSS-M8-PC SWAS-10-VF SWAS-12-VF SWAS-2.5-VF SWAS-2-VF SWAS-3-VF SWAS-4-VF SWAS-5-VF SWAS-6-VF SWAS-8-VF SWAS-10-VF-PC SWAS-12-VF-PC SWAS-3-VF-PC SWAS-4-VF-PC SWAS-5-VF-PC SWAS-6-VF-PC SWAS-8-VF-PC SVSLG-M3-PC SVSLG-M4-PC SVSLG-M5-PC SVSLG-M6-PC SVSI1S-M3-PC SVSI1S-M4-PC SVSI1S-M5-PC SVSI1S-M6-PC SVFSS-M4-PC SVFSS-M5-PC SVFSS-M6-PC SVFSS-M8-PC SSC-SVSS-M3 SSC-SVSS-M4 SSC-SVSS-M5 SSC-SVSS-M6 SSC-SVSS-M8 SVST-M3 SVST-M4 SVST-M5 SVSHT-M3 SVSHT-M4 SVSHT-M5 SVSHT-M6
Image Vented Socket Head Cap Screws with Small Head - Titanium Vented Socket Head Cap Screws with Ultra Low Profile & Small Head - Titanium Hexagon Head Bolts (with Ventilation Hole) Phillips Cross Recessed Flat Head Titanium Machine Screws (with Ventilation Hole) Phillips Cross Recessed Pan Head Titanium Machine Screws (with Ventilation Hole) Hex Socket Head Cap Screws (with Ventilation Hole / Inch Screws) Cover Caps Socket Head Cap Screws - Specialized Chemical Polishing Flanged Socket Head Cap Screws - Specialized Chemical Polishing
Part Name Vented Socket Head Cap Screws with Small Head - Titanium Vented Socket Head Cap Screws with Ultra Low Profile & Small Head - Titanium Hexagon Head Bolts (with Ventilation Hole) Phillips Cross Recessed Flat Head Titanium Machine Screws (with Ventilation Hole) Phillips Cross Recessed Pan Head Titanium Machine Screws (with Ventilation Hole) Hex Socket Head Cap Screws (with Ventilation Hole / Inch Screws) Cover Caps Socket Head Cap Screws - Specialized Chemical Polishing Flanged Socket Head Cap Screws - Specialized Chemical Polishing
Part Number SVST-SD SVSHT-SD SVHS SVFT SVPT SVSS(INCH) SCAP-AL SNSS-PC SFSS-PC
Feature Small Head
Lightweight
Non-magnetic
Chemical Resistance
Lightweight		 Special Low Profile
Small Head
Space-saving
Lightweight
Non-magnetic
Chemical Resistance
Lightweight		 Hex head screws Titanium Phillips Cross Recessed Flat Head Machine Screw
Low outgas
Nonmagnetic		 Titanium Phillips Cross Recessed Pan Head Machine Screw
Low outgas
Nonmagnetic		 Inch Thread
Socket Head Cap Screws		 Low Outgas
Corrosion Resistance		 Low Outgas Flanged
Low Outgas
Material Grade 2 Titanium Grade 2 Titanium SUSXM7 (Equivalent to SUS304) Grade 2 Titanium Grade 2 Titanium Equivalent to SUS304 A5056 SUSXM7 (Equivalent to SUS304) SUSXM7 (Equivalent to SUS304)
Surface Treatment Special Chemical Polishing Special Chemical Polishing - Special Chemical Polishing Special Chemical Polishing - - Special Chemical Polishing Special Chemical Polishing
Thread Size M3 ～ M5 M3 ～ M6 M3 ～ M8 M3 ～ M4 M3 ～ M5 No.4-40UNC ～ 1/4-20UNC M5 ～ M16 M3 ～ M8 M4 ～ M8
Operating Temperature (℃) - - - - - - - - -
CAD CAD CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SVST-M3-SD SVST-M4-SD SVST-M5-SD SVSHT-M3-SD SVSHT-M4-SD SVSHT-M5-SD SVSHT-M6-SD SVHS-M3 SVHS-M4 SVHS-M5 SVHS-M6 SVHS-M8 SVFT-M3 SVFT-M4 SVPT-M3 SVPT-M4 SVPT-M5 SVSS-#10-24 SVSS-#10-32 SVSS-#4-40 SVSS-#5-40 SVSS-#6-32 SVSS-#8-32 SVSS-1/4-20 SCAP-10-AL SCAP-3-AL SCAP-4-AL SCAP-5-AL SCAP-6-AL SCAP-8-AL SNSS-M3-PC SNSS-M4-PC SNSS-M5-PC SNSS-M6-PC SNSS-M8-PC SFSS-M4-PC SFSS-M5-PC SFSS-M6-PC SFSS-M8-PC
Image Socket Head Cap Screws - 316L Stainless Steel - Specialized Chemical Polishing High Strength Stainless Steel Socket Head Cap Screws - Specialized Chemical Polishing Flanged Socket Head Cap Screws - Low Temperature Black Chrome Treatment High Strength Stainless Steel Socket Head Cap Screws – Low Temperature Black Chrome Treatment Socket Head Cap Captive Screws - Low Temperature Black Chrome Treatment Titanium Hex Socket Head Cap Screws with Captive Washers Titanium Hex Socket Head Cap Screws with Captive Washers
Part Name Socket Head Cap Screws - 316L Stainless Steel - Specialized Chemical Polishing High Strength Stainless Steel Socket Head Cap Screws - Specialized Chemical Polishing Flanged Socket Head Cap Screws - Low Temperature Black Chrome Treatment High Strength Stainless Steel Socket Head Cap Screws – Low Temperature Black Chrome Treatment Socket Head Cap Captive Screws - Low Temperature Black Chrome Treatment Titanium Hex Socket Head Cap Screws with Captive Washers Titanium Hex Socket Head Cap Screws with Captive Washers
Part Number SNSL-PC SNSLG-PC SFSS-RY SNSLG-RY SSC-RY SNSI1T SNSI3T
Feature Heat Resistance
Corrosion Resistance
Non-magnetic
Low Outgas		 High Strength (Strength Class 10.8 Equivalent)
Low Outgas
Non-magnetic 		Flanged
Chemical Resistance
Anti-reflection
Seizing Prevention		 High Strength (Strength Class 10.8 Equivalent)
Non-magnetic
Chemical Resistance
Anti-reflection
Seizing Prevention		 Chemical Resistance
Anti-reflection
Seizing Prevention
Captive /
Loss Prevention		 Captive Washers
I=1		 Captive Washers
I=3
Material SUS316L SUS316L SUSXM7 (Equivalent to SUS304) SUS316L SUSXM7 (Equivalent to SUS304) Grade 2 Titanium Grade 2 Titanium
Surface Treatment Special Chemical Polishing Special Chemical Polishing Low temperature black chrome treatment Low temperature black chrome treatment Low temperature black chrome treatment Special Chemical Polishing Special Chemical Polishing
Thread Size M3 ～ M8 M3 ～ M6 M4 ～ M8 M3 ～ M6 M3 ～ M8 M3 ～ M6 M3 ～ M6
Operating Temperature (℃) - - - - - - -
CAD CAD CAD CAD CAD CAD CAD CAD
Specifications Specifications Specifications Specifications Specifications Specifications Specifications Specifications
List SNSL-M3-PC SNSL-M4-PC SNSL-M5-PC SNSL-M6-PC SNSL-M8-PC SNSLG-M3-PC SNSLG-M4-PC SNSLG-M5-PC SNSLG-M6-PC SFSS-M4-RY SFSS-M5-RY SFSS-M6-RY SFSS-M8-RY SNSLG-M3-RY SNSLG-M4-RY SNSLG-M5-RY SNSLG-M6-RY SSC-M3-RY SSC-M4-RY SSC-M5-RY SSC-M6-RY SSC-M8-RY SNSI1T-M3 SNSI1T-M4 SNSI1T-M5 SNSI1T-M6 SNSI3T-M3 SNSI3T-M4 SNSI3T-M5 SNSI3T-M6

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Galling and Seizing

Galling and Seizing

This is a phenomenon that occurs while tightening, where the surface of the screw thread melts or welds due to frictional heat and the screw stops moving. To resolve galling, NBK's special surface treatment screws, such as those with fluorine coating, are recommended.

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Various head diameters and heights are available for the same screw diameters, contributing to saving space.

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Select characteristics/function

Vacuum Cleanroom Specification Space Chemical-proof High strength High Specific Strength Heat-resistance Seizing & Sticking Prevention Antireflection Electrical Insulation Electric conducting Nonmagnetic Light Weight Easy to Use Loss Prevention Decoration Fixing/Positioning

Select Thread Size (Metric thread)

M2 M2.5 M2.6 M3 M4 M5 M6 M8 M10 M12 M16

Select Thread Size (Inch thread)

No.4-40UNC No.5-40UNC No.6-32UNC No.8-32UNC No.10-32UNF No.10-24UNC 1/4-20UNC

Select screw length（mm）

3 4 5 6 8 8.6 10 10.8 11.2 12 12.6 13.2 14 15 16 16.8 17.7 18 20 20.6 20.8 21.2 21.7 22 25 25.8 26.2 26.7 30 31.2 35 36.7 40 45 50 60 70 80 90 100 120 150

Select screw length（inch）

1" 1/2" 1/4" 1-1/2" 1-1/4" 1-3/4" 2" 3/16" 3/4" 3/8" 5/16" 5/8" 7/8"

Select material

Stainless Steel SUS304 Equivalent to SUS304 SUSXM7 (Equivalent to SUS304) SUS316L HiMo SUS316L Aluminum A5056 Titanium Grade 2 Titanium Nickel Alloy Inconel equiv. Hastelloy equiv. Molybdenum Pure Molybdenum Ceramic Al2O3 (Alumina 99.5%) Plastic PTFE (Polytetrafluoroethylene)

Stainless Steel

SUS304 Equivalent to SUS304 SUSXM7 (Equivalent to SUS304) SUS316L HiMo SUS316L

Aluminum

A5056

Titanium

Grade 2 Titanium

Nickel Alloy

Inconel equiv. Hastelloy equiv.

Molybdenum

Pure Molybdenum

Ceramic

Al2O3 (Alumina 99.5%)

Plastic

PTFE (Polytetrafluoroethylene)

Select thread/components

Bolts/Machine Screws Washer Setscrew Clamping Bolts/Screws Hexagon Posts Cover Caps

Select head shape

Cap Pan Flat Hexagon Low Profile Special Low Profile Small Head No

Select drive shape

Hex Sockets Cross-recessed sockets No

Select processing

With Through Hole With Relief Cut With Built-in Washer With Groove

Select surface treatment

Special Chemical Polishing Surface hardening treatment Stainless Steel Black Silver plating Low temperature black chrome treatment Molybdenum Disulfide Shot Treatment

Select coarse/fine

Coarse Fine